Programmer Group

Summary Online project publishing generally has the following schemes: Downtime release Blue green deployment Rolling deployment Grayscale release This kind of release is usually released at night or during major version upgrade. Because it needs to be stopped, now everyone is studying Devops scheme. Blue green deployment requires t ...

adlist Adlist is one of the basic data structures of Redis. It is a two-way linked list and records the length of the linked list. The iterator of adlist records the iteration node and direction. I think the implementation of list is better than STL Several important structures The implementation of adlist is relatively simp ...

First thanks easyWechat Author, provides a very useful SDK! Next thanks Feishan Snow Leopard Although I took a lot of detours after reading this post (I was too foolish), without this post, I just looked at the WeChat documents and had no idea at all. Finally, greet the author of the WeChat document!!! WeChat posted the detected documen ...

Because the front-end needs user information userInfo, and the back-end modules, such as reports, also need user information, the frequency of query is very high, involving more linked tables. However, the actual system users are small and the data is basically unchanged. For the convenience of each module, it is decided to adopt caching. Choos ...

Premise of use: stub dummy data is used when the interface does not exist (i.e. message 404) Entrance: In BusinessExceptionHandlerAdvice NoHandlerFoundException Exception capture method Flow chart   Where is the configuration file read? In oa/web/controller/handler/EnvironmentInit.java, EnvironmentInit implements ApplicationListener ...

Thank you for your reference- http://bjbsair.com/2020-04-01/tech-info/18382.html Current restriction at the consumer end# 1. Why limit the flow to the consumer# Suppose a scenario, first of all, our Rabbitmq server has a backlog of tens of thousands of unprocessed messages. If we open a consumer client, we will see this situation: a huge amount ...

1. Install filebeat to the target machine Official installation documents This test uses windows environment to install filebeat win: 1. Download the Filebeat Windows zip file from the downloads page. 2. Extract the contents of the zip file into C:\Program Files. 3. Rename the filebeat--windows directory to Fil ...

1, Verification code introduction The main way of generation: 1. Use Java Native mode, including the use of Servlet, AWT and ImageIO; 2. Use open source libraries, such as Jcaptcha, Kaptcha; (open source library of each graphic verification code: http://www.oschina.net/project/tag/248/captcha?lang=19) In addition, the generated code can be ...

Cluster building environment, one Centos7 virtual machine (192.168.217.128), six redis nodes redis-4.0.2 Install redis: follow the steps on the official website, and we won't talk about it here. Enclosed address https://redis.io/download， Note that there may be errors (redis tarError) during the installation process. ...

SpringBootApplication annotation @Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Documented @Inherited @SpringBootConfiguration @EnableAutoConfiguration @ComponentScan(excludeFilters = { @Filter(type = FilterType.CUSTOM, classes = TypeExcludeFilter.class), @Filter(type = FilterType.CUSTOM, classes = AutoConfigu ...